Summary
Summary Population Ecology IEB 2024 Notes
- Course
- Institution
in depth summary of the population ecology section for ieb 2024 life sciences students.
[Show more]
Seller
Follow
Reecewilliamson
Reviews received
Content preview
POPULATIONECOLOGY NOTES
MATRIC IEB LIFE
SCIENCE
, POPULATION ECOLOGY
The study of interactions of organisms with their physical and biological environments
and how these determine the distribution and make-up of populations within an
ecosystem
- Biosphere: part of the earth where organisms are found
- Ecosystem: made up of groups of different species of organisms that interact with each other
and with the environment
- Organism: an individual form of life composed of a single cell or complex of cells which can
grow and reproduce EG. Bacteria, protest, plant
- Community: a group of different species that inhabit and interact
- Species: a group of closely related organisms, very similar to each other. Capable of
interbreeding and producing fertile offspring
- Individual: single organism capable of independent existence
- Population: a group of organisms of the same species that occupy the same area and can
breed freely with each other
- Demographics: statistical information about the population
,The size of a population
The total number if individuals in the population.
• Natality – birth rate of a population, normally
expressed as the number of live births per thousand
individuals per year
• Mortality – death rate of a population, normally
expressed as the number of deaths per thousand
individuals per year
• Immigration – one way movement of organisms into an
area where they become established
• Emigration – one way movement of organisms out of
an area to become established
CLOSED POPULATION: A population where there is no
immigration or emigration
Eg. A fish pond that does not have a stream running into or out
of it.
, HOW IS GROWTH OF A POPULATION
REGULATED
• The number of favourable conditions in which a population lives will WHAT DETERMINES SURVI
determine the speed at which the population grows. 1. tolerate the environment
they live eg: physical environ
• If a few individuals enter an unoccupied area where all conditions for growth competition, predation
are favourable: 2. access the natural resourc
• ie: unlimited food, water, and no predators, obtain energy and nutrients,
mates
• the population will grow at the maximum possible growth rate
These requirements form the
• ie: it will grow exponentially. (increase more and more) ecological niche of the indivi
all the requirements needed
BUT WHAT STOPS EXPONENTIAL GROWTH IS survival & reproduction
the amount of resources decreases eg: less food
à intraspecific competition : food, water, space, shelter and
suitable mates.
The total number of factors [limiting factors] that stop a
population from reproducing at its maximum rate is known as:
ENVIRONMENTAL RESISTANCE
And the resulting growth pattern is à Logistic growth pattern
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Reecewilliamson. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.98. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now